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MA: Fachverband Magnetismus

MA 27: Ultrafast Magnetization Effects I

MA 27.9: Vortrag

Mittwoch, 11. März 2026, 12:00–12:15, HSZ/0004

Time-resolved wide-field SHG imaging of ferroic materials — •Andrin Caviezel, Jan Gerrit Horstmann, Thomas Lottermoser, and Manfred Fiebig — Department of Materials, ETH Zurich, Zurich, Switzerland

We investigate the ultrafast dynamics of van der Waals ferroics using time-resolved second harmonic generation (SHG) wide-field imaging. Controlling antiferromagnetic order on ultrafast timescales is of central relevance for spintronic applications, and van der Waals ferroics constitute highly promising material platforms. However, achieving such control requires an experimental technique that is simultaneously sensitive to ferroic order and combines micrometer spatial with femtosecond temporal resolution. Here, we present a setup for direct wide-field visualization of ferroic domain structures by exploiting SHG generated from high-energy pulses of an amplified laser system. The adjustable wavelength and polarization of pump and probe pulses, together with tailored pulse sequences for excitation, enable sensitive detection and selective manipulation of magnetic order. Our approach provides access to ultrafast processes in bulk ferroics with microscopic domain patterns as well as in micrometer-sized flakes of van der Waals ferroics under cryogenic conditions, opening new pathways for understanding and steering their nonequilibrium dynamics.

Keywords: Ferroic materials; Second harmonic generation (SHG); Ultrafast dynamics; Non-linear imaging